Explicitly mark unused parameters to resolve warnings

Reduce log spam during build.

Change-Id: Id0734c3a5bc08f728ca868a5a18375d8fc16bae6
diff --git a/Makefile.am.inc b/Makefile.am.inc
index fec591b..dec1255 100644
--- a/Makefile.am.inc
+++ b/Makefile.am.inc
@@ -1,2 +1,2 @@
-AM_CFLAGS = -Wall -Werror -Wno-error=deprecated-declarations -Wextra -Wwrite-strings -Wno-unused-parameter -std=gnu99 -D_GNU_SOURCE -D_REENTRANT
+AM_CFLAGS = -Wall -Werror -Wno-error=deprecated-declarations -Wextra -Wwrite-strings -std=gnu99 -D_GNU_SOURCE -D_REENTRANT